INFO: task syz.3.1233:15155 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1233      state:D stack:24960 pid:15155 tgid:15154 ppid:13483  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1585/0x5340
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x290
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5bf9d9c799
RSP: 002b:00007f5bfac97028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f5bfa015fa0 RCX: 00007f5bf9d9c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f5bfa015fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5bfa016038 R14: 00007f5bfa015fa0 R15: 00007ffdddaa1f08
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5632:
 #0: ffff8881114ac0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
2 locks held by syz-executor/10665:
1 lock held by syz.3.1233/15155:
 #0: ffff88810733e0e0 (&type->s_umount_key#59){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/17148:
1 lock held by syz.9.1451/17157:
 #0: ffff88810733e0e0 (&type->s_umount_key#59){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz.2.1756/19407:

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 18107 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x30/0x90
Code: 04 24 65 48 8b 15 c8 af 55 11 65 8b 0d e9 af 55 11 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 54 16 00 00 00 74 52 <8b> 8a 30 16 00 00 83 f9 03 75 47 48 8b 8a 38 16 00 00 44 8b 8a 34
RSP: 0018:ffffc9000ab2fb50 EFLAGS: 00000246
RAX: ffffffff82162e82 RBX: ffff8881acbf5700 RCX: 0000000000000000
RDX: ffff8881acbf5700 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000000c9 R08: ffffc9000ab2fc8f R09: 0000000000000000
R10: ffffc9000ab2fc20 R11: fffff52001565f92 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff8c26eb80 R15: 0000000000000000
FS:  000055558b43d500(0000) GS:ffff8882a946c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558b458a28 CR3: 0000000195c48000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __might_fault+0x52/0x130
 _copy_to_user+0x2c/0xb0
 cp_new_stat+0x3c3/0x540
 __x64_sys_newfstatat+0x176/0x200
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f980939adda
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 07 31 c0 c3 0f 1f 40 00 48 c7 c2 e8 ff ff ff f7
RSP: 002b:00007ffcd691caa8 EFLAGS: 00000286 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f980939adda
RDX: 00007ffcd691cad0 RSI: 00007ffcd691cb60 RDI: 00000000ffffff9c
RBP: 00007ffcd691cb60 R08: 00007ffcd691db60 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000286 R12: 00007ffcd691dbf0
R13: 00007f9809431f90 R14: 00000000000772a3 R15: 00007ffcd691dc30
 </TASK>
